Use of Self-Assembling Monolayers to Control Interface Bonding in a Model Study of Interfacial Fracture

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Description

The relationships between the extent of interfacial bonding, energy dissipation mechanisms, and fracture toughness in a glassy adhesive/inorganic solid joint are not well understood. We address this subject with a model system involving an epoxy adhesive on a polished silicon wafer containing its native oxide. The extent of interfacial bonding, and the wetting behavior of the epoxy, is varied continuously using self-assembling monolayers (SAMs) of octadecyltrichlorosilane (ODTS). The epoxy interacts strongly with the bare silicon oxide surface, but forms only a very weak interface with the methylated tails of the ODTS monolayer. We examine the fracture behavior of such joints ... continued below

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5 p.

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Kent, M.S.; Matheson, A.; Reedy, E.D. & Yim, H. March 5, 1999.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The relationships between the extent of interfacial bonding, energy dissipation mechanisms, and fracture toughness in a glassy adhesive/inorganic solid joint are not well understood. We address this subject with a model system involving an epoxy adhesive on a polished silicon wafer containing its native oxide. The extent of interfacial bonding, and the wetting behavior of the epoxy, is varied continuously using self-assembling monolayers (SAMs) of octadecyltrichlorosilane (ODTS). The epoxy interacts strongly with the bare silicon oxide surface, but forms only a very weak interface with the methylated tails of the ODTS monolayer. We examine the fracture behavior of such joints as a function of the coverage of ODTS in the napkin-ring geometry. Various characterization methods are applied to the ODTS-coated surface before application of the epoxy, and to both surfaces after fracture. The fracture data are discussed with respect to the wetting of the liquid epoxy on the ODTS-coated substrates, the locus of failure, and the energy dissipation mechanisms. Our goal is to understand how energy is dissipated during fracture as a function of interface strength.

Physical Description

5 p.

Notes

OSTI as DE00004261

Medium: P; Size: 5 pages

Source

  • Annual Meeting of the Adhesion Society, Panama City, FL (US), 02/19/1999--02/24/1999

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  • Report No.: SAND99-0558C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 4261
  • Archival Resource Key: ark:/67531/metadc681877

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  • March 5, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 11, 2017, 12:43 p.m.

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Kent, M.S.; Matheson, A.; Reedy, E.D. & Yim, H. Use of Self-Assembling Monolayers to Control Interface Bonding in a Model Study of Interfacial Fracture, article, March 5, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc681877/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.